functions-and-operators: fix JSON_DEPTH() example path to match its own JSON document (#23865)

[ti-chi-bot]

This is an automated cherry-pick of #23865

What is changed, added or deleted? (Required)

The JSON_DEPTH() example in functions-and-operators/json-functions/json-functions-return.md
lists three path levels — `$`, `$.weather`, and (labeled "weather
current") `$.weather.sunny`. But the actual JSON document used in the
example right below is {"weather": {"current": "sunny"}}, where "sunny"
is the value, not a key — the real third-level path is `$.weather.current`.

Fixes the path in the bullet list to match the document the example
actually queries. (Found while translating this file into Japanese; the
Japanese-side inconsistency this caused is fixed separately.)

Verified against a live TiDB instance (tiup playground, TiDB v8.5.x):

mysql> SELECT JSON_EXTRACT('{"weather": {"current": "sunny"}}', '$.weather.current') AS via_current,
              JSON_EXTRACT('{"weather": {"current": "sunny"}}', '$.weather.sunny') AS via_sunny;
+-------------+-----------+
| via_current | via_sunny |
+-------------+-----------+
| "sunny"     | NULL      |
+-------------+-----------+

$.weather.current correctly resolves to "sunny"; $.weather.sunny does
not exist in the document and returns NULL, confirming the path in the
bullet list was wrong.

Which TiDB version(s) do your changes apply to? (Required)

• release-8.5 (TiDB 8.5 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Corrected the JSON_DEPTH() example path to match the accompanying JSON document and SQL query.

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Reviewing files that changed from the base of the PR and between eed05b5 and c243721.

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• functions-and-operators/json-functions/json-functions-return.md

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📝 Walkthrough

Walkthrough

The JSON_DEPTH() example now uses $.weather.current, matching the path in the example JSON document and SQL query.

Changes

JSON function documentation

Layer / File(s)	Summary
Correct JSON_DEPTH() example path functions-and-operators/json-functions/json-functions-return.md	The example path changes from $.weather.sunny to $.weather.current.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to c2437

The example now documents the JSON path used by its own JSON document, so it is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the documentation area and the specific JSON_DEPTH() path correction.
Description check	✅ Passed	The description explains the change, the reason for the correction, the affected TiDB version, verification results, AI involvement, and applicable change categories. The version label uses release-8.…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests

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